Metafields are a flexible way for your app to add and store additional information about a Shopify resource, such as a product, a collection, and many other owner types. The additional information stored in metafields can be almost anything related to a resource. Some examples are specifications, size charts, downloadable documents, release dates, images, or part numbers.

Merchants and other apps can retrieve and edit the data that's stored in metafields from the Shopify admin. You can also access metafields in themes using Liquid and through the Storefront API.